Source:http://linkedlifedata.com/resource/umls/id/C1511680
GO: Any process that modulates the frequency, rate or extent of the covalent transfer of a methyl group to either N-6 of adenine or C-5 or N-4 of cytosine. [GOC:jl],NCI: DNA Methylation Regulation involves cellular mechanisms that control covalent addition of methyl groups to specific cytosine residues of a DNA molecule, which typically influence gene expression and other genetic functions.